Proceedings of Online Meetup: Shape-Controlled Nanocrystals: Synthesis, Characterization Methods and Applications (ShapeNC)
Publication date: 6th May 2020
In this talk, I will present our recent group efforts towards the synthesis via colloidal chemistry of atomically defined copper nanocrystals (NCs) and their use as CO2RR catalysts.
First of all, I will focus on our studies aimed at advancing the knowledge on the formation mechanisms of such Cu NCs, which is quite limited compared to the one acquired by the community for Au, Ag and other noble metals. I will present our integrated approach, which include in-situ X-ray absorption and scattering spectroscopy , along with ex-situ techniques (mass spectroscopy, NMR, electron microscopy), to identify reaction intermediates and then correlated their conversion kinetics to the subsequent nucleation and growth mechanisms of the Cu NCs.1,2
I will then briefly illustrate how these NCs with precisely tunable shapes and sizes can help to identify selectivity rules at the branching nodes which lead to C1 and C2+ reduction products in CO2RR.3-5
References
[1] M. Strach, V. Mantella, J.R. Pankhurst, P. Iyengar, A. Loiudice, S. Das, C. Corminboeuf, W. van Beek, R. Buonsanti* “Insights into reaction intermediates to predict synthetic pathways for shape-controlled metal nanocrystals” J. Am. Chem. Soc. 2019, 141,16312.
[2] V. Mantella, M. Strach, K. Frank, J.R. Pankhurst, D. Stoian, C. Gadiyar, B. Nickel, R. Buonsanti* “Polymer Lamellae as Reaction Intermediates of Cu Nanospheres Evidenced by In-situ-X-ray Studies” Angew. Chemie. Int. Ed. 2020, just accepted
[3]A. Loiudice, P. Lobaccaro, E.A. Kamali, T. Thao, B.H. Huang, J.W. Ager, R. Buonsanti*, Tailoring Copper Nanocystals towards C2 Products in Electrochemical CO2 reduction, Angew. Chemie. Int. Ed. 2016, 55, 5789.
[4] P. Iyengar J. Huang, G.L. De Gregorio, C. Gadiyar, R. Buonsanti* “Size-dependent selectivity of Cu nano-octahedra catalysts for the electrochemical CO2 reduction to CH4” Chem. Commun. 2019, 55, 8796.
[5] G. De Gregorio, T. Burdyny, A. Loiudice, P. Iyengar, W. Smith, R. Buonsanti* “Facet-dependent selectivity of Cu catalysts in electrochemical CO2 reduction at commercially viable current densities”, ACS Catalysis 2020, 10, 4854.
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